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On Linux, you can run KLayout from the terminal to get some more information. On Windows there is no terminal, but there is a log viewer (File/Log Viewer). If the application doesn't start however that's not really helpful.
Usually, KLayout wouldn't crash if the klayoutrc file is corrupt - it would just show an error and continue. So I wonder what's wrong in your case. If you send the klayoutrc (see Contact page for details), I could try to fix it.